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What treatment or coating (if any) should be applied to the inside of a steel hull before applying sprayed foam (PUR or PIR) insulation? Thanks

I posted this in multihulls but on reflection it is probably more relevant here: Unstayed mast build for small canoe based trimaran. https://www.boatdesign.net/threads/unstayed-mast-build-for-small-canoe-based-trimaran.68292/

I am planning to build a replacement unstayed mast for my 16ft trimaran. The previous mast was 13 years old, and failed due, I think, to a combination of corrosion and pushing it too hard when I should have reefed. The previous mast was a total of 18ft / 5.6m tall, carrying 44 square feet (4...

'So, you're proposing an underwater railway, with a passenger carrying superstructure on stilts, powered by electricity? ' 'Yes, precisely.' 'What could possibly go wrong! Please, take my money!'...

Not quite sure where to put this. I've just had another wonderful trip in my wee sailing canoe with my mate, but there was precious little wind, so we were paddling a great deal. Its got me animated about tides, and their complexity, as with only human power, tides become particularly...

I thought members might enjoy these relatively early and very beautiful, detailed patent drawings, filed by Frederick Jordan, for construction of substantial ships in concrete, which I came across through the work of my friend Chris Marsden. Chris has researched tirelessly the early development...

I have a somewhat elderly (8 years old?) but very good, very water resistant LED head torch for which the on/off switch has become increasingly intermittent to the point of hardly working at all. The unit is sealed and there are no spares still available. I'm resolved to buying a replacement...

https://twitter.com/TheDreadShips/status/1321124154494636039?fbclid=IwAR3rE0BJtkD0zaGtAdkAxJ3OycNEIIliwJ6rJBcRcvEY7T36aSyTHLwDeLQ 'The resulting conversation with the brass is unlikely to feature biscuits.' Containership Maersk Launceston and Greek Minesweeper Collide Off Piraeus...

'From the Strait of Gibraltar to Galicia, orcas have been harassing yachts, damaging vessels and injuring crew' Killer whales launch ‘orchestrated’ attacks on sailing boats https://www.theguardian.com/environment/2020/sep/13/killer-whales-launch-orchestrated-attacks-on-sailing-boats

I have a Christmas tree canoe trailer and have twice built a simple ply box under the lowest rung for gear storage. I've used 1/2 inch and 3/4 inch WBP ply, 3 coats of cellulose paint, and twice the bottom has rotted out in under 2 years. The box lids lap over with a downstand, and the hinges...

I have a problem. My son broke the head off his guitar (I didn't ask!), and I made the repair with araldite 2 part epoxy adhesive. This was six months ago, and he has been using it happily since. The joint has just failed again, under the tension from the strings, and the remaining araldite in...

Found on Facebook. The class rules seem to be 'measure the pink one.' Whatever rig you like, as far as I can acertain. Sorry, only fb videos, can't find anything on YT: Log into Facebook | Facebook https://www.facebook.com/cammi.burgess/videos/2241885892560116/ Log into Facebook |...

Nile shipwreck discovery proves Herodotus right – after 2,469 years https://www.theguardian.com/science/2019/mar/17/nile-shipwreck-herodotus-archaeologists-thonis-heraclion

This is my 16ft Solway Dory trimaran. It carries about 8 sq metres of sail. A couple of years back, while pushing it hard, the leeboard partially popped a flake of ply out of the hull, just below the pivot. The leeboard is 1.3metres long, and is quite a powerful foil. I repaired the...

for those of you who are bored with the levels of skill, expertise and craftsmanship displayed in the Tally Ho! restoration, for those of you who find that building merely a canoe out of cardboard is for cissies, Here is the Cardboard Houseboat. Enjoy....

ETH Zurich team creates all-concrete SkelETHon canoe built on slender "bones" https://www.dezeen.com/2017/06/27/eth-zurich-team-designs-all-concrete-skelethon-canoe-slender-3d-printed-bones/

I've wanted to have a go at steam bending for a while and the need arose with a model project. I'm putting mahogany gunnels on a 13 inch fibre glass clinker row boat hull. the section is 3mm x 3mm. i saw a YouTube recommending using a baking dish full of boiling water as an easy way for small...

Sweeney Kincaid Industrial Auctioneering https://www.sweeney-kincaid.com/Sales/SaleDescription.aspx?SaleId=3112 As or whole, (270 boats) 0ffers by email by 12 noon 21st July2017. or in parts if no buyer for the whole is found, online offers by noon 26th July 2017.

Colin Skeath and his nephew, Davis Gould-Duff are currently engaged in a round Britain attempt, paddling and sailing a canoe. Canoe Around Britain https://www.facebook.com/Canoe-Around-Britain-232889657123536/ They departed from Strontian, where Colin and his wife Katrina live, on 30th April...

This is excellent. An animation of all the world's shipping for 2012 on a global map, with filters to show routes, ports and category of shipping. https://www.shipmap.org/